import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/login")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 1. 读取请求传来的参数(用户名和密码)
        req.setCharacterEncoding("utf8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        // 2. 判断用户名和密码
        if(!"zhangsan".equals(username) || !"123".equals(password)){
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("用户名或密码错误");
            return;
        }
        // 3. 登陆成功后 为该用户创建会话
        HttpSession session = req.getSession(true);
        // Attribute方式在会话中保存自定义数据
        session.setAttribute("username",username);
        session.setAttribute("loginTime",System.currentTimeMillis());
        // 4. 让页面跳转的网站首页
        resp.sendRedirect("index");

    }
}
